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3 years ago

Select the correct answer.

Mathematics

2 answers:

nasty-shy [4]3 years ago

6 0

C. Is the answer. Put those numbers in for x and y

trapecia [35]3 years ago

3 0

Answer is C
hope this helped

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The sales of a grocery store had an average of $7,000 per day. The store introduced several advertising campaigns in order to in

Sati [7]

Answer:

a.The advertising campaigns increased the average daily sales.

Step-by-step explanation:

This is a hypothesis test for the population mean.

The claim is that the advertising campaigns increased the average daily sales.

Then, the null and alternative hypothesis are:

$H_0: \mu=7000\\\\H_a:\mu> 7000$

The significance level is 0.05.

The sample has a size n=100.

The sample mean is M=7280.

The standard deviation of the population is known and has a value of σ=1000.

We can calculate the standard error as:

$\sigma_M=\dfrac{\sigma}{\sqrt{n}}=\dfrac{1000}{\sqrt{100}}=100$

Then, we can calculate the z-statistic as:

$z=\dfrac{M-\mu}{\sigma_M}=\dfrac{7280-7000}{100}=\dfrac{280}{100}=2.8$

This test is a right-tailed test, so the P-value for this test is calculated as:

$\text{P-value}=P(z>2.8)=0.0026$

As the P-value (0.0026) is smaller than the significance level (0.05), the effect is significant.

The null hypothesis is rejected.

There is enough evidence to support the claim that the advertising campaigns increased the average daily sales.

7 0

3 years ago

Set X = {x|x is a whole number less than or equal to 10} and set Y = {/15, 10, 15, 20}

SIZIF [17.4K]

Answer:

Step-by-step explanation:

The first part requires the intersection of the two sets, which means only the elements that can be found in both sets.

While the second part requires all the elements in both the sets.

7 0

3 years ago

(3x^2-9x+2)-(-x^2+2x+5)

myrzilka [38]

Here, since the negative must be distributed to every item in the right parenthesis, it would be:
3x^2 - 9x + 2 +x^2 - 2x -5 = 4x^2 - 11x -3
Hope this helped!

3 0

3 years ago

The quotient of the difference between 5 and a number n and 2 write an algebraic expression that models each word phrase

dexar [7]

"÷" quotient

"-" difference

(5 - n) ÷ 2 = (5 - n)/2

7 0

4 years ago

ANOTHER QUESTION:

iris [78.8K]

If there are 3 red blocks for every 5 blocks
if we multiple both numbers by 12 to make every 60 blocks we get:
36 red blocks every 60 blocks
since you have 36 and you only need 32 then yes you will have enough

5 0

3 years ago